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@einen tart-ee stmt. @ffice LEWIS J. ATWOOD, OF WATEBBURY, CONNECTICUT, ASSIGNOR TO HIMSELF AND HOLMES, BOOTH, AND HAYDENS, OF SAME PLACE.

Letters Patent No. 73,488, dated January 21, 1868,

IMPROVEMENT IN LAMPS.

TO ALL WHOM IT MAY OONCERN:

" "M Be it -known that I, LEWIS J. ATWOOD, of Waterbury, in the county of New Haven, and State of Connecticut, have invented, made, and applied to use a certain new and useful Improvement in Lamps; and I do hereby declare the following to be a full, clear, and exact description of my said invention, reference being had to the annexed drawing, making part o'f this specification, whereinv Figure 1' is a vertical section of my improved lamp, the'draught-plate and chimney being shown ns raised oi the wick-tube and reservoir. v

Figure 2 is an inverted plan of the air-distributer and tapering wick-tube guide.

Similar marks of reference denote the same parts.

Heretofere an argand-lnmp has been made with a. glass chimney, in which a draught-plate was aixed, to direct the air upon the flame. The glasschimney has also 'been contracted for a similar purpose. In Letters Patent grunted to me, October 1,3, 18623, a draught-plate is shown in the chimney, in connection with a hinged burner.` i v The nature of my present invention consists in a helical expansive chimney-clamp applied to the burner, and acting within the chimney, to retain the same in place; also, in a series of vertical scallops or spring around the edge of the airdistributer, to receive the base of the chimney, in combination with a draught-plate r within the chimney, so that the chimney is removable, but rmly steadied'in use. I also make use of a tapering guide between the air-distributer and the base ofthe borner, in combination with said draught-plate, so that the ilame-slot'in the same is brought to the proper position by the act of placing the movable portion on the stationary part of the burner.

In the drawing, a represents the reservoir for kerosene or other hydrocarbon, b the'screw-cnp, e the `Wiclt-tube, d the \viekraiser, and`l the cover to the ratchet. e is the perforated air-distributer, upon the edge of which the chimneyf is to rest, and a rim of any desired ornamentation may be turned up for the said chimney to s'et within. In the central part of the air-distributor e is the tapering guide g, that has a circular open base, and tapers up to an opening corresponding to the shape of the wick-tube c, but with notches at z', to allow the air-distributer and other parts to lie lifted up off the wick-tube without extinguishing the amc, or replaced thereon, as occasion may require, and when in place, the upper portion Zot Athe cap c, receiving the hase of the conical guide g, causes the parts to set rmiy upon the lamp, and the tapering er conical form of said guide g allows the parts to be placed over the wick-tube with great facility, and it is impossible for the same, and the parte connected with it, to be misplaced. The draught-plate h'is of asize to set freely within the chimney f, 1 and the said draught-plate t is supported by the metallic strips er connections 7c, that extend from it to the guide g, or to the air-distributor e. Around the periphery of this draughbplatc t, I form a range of small holes, and thread thereinto the expansive helical spring m. This is effected by revolving the spring, and having been wound with its coils rather farther apart than the distance between said holes, the spring becomes un ex pensive interior clamp to the chimney, that is forced over it withgreat case, but is securely held by that and the edge of the nir-distributer e.1 It will now be understood that the lower part of the chimneyf and airdisrrilmier e, being so far removed from the flame, are but little heated, and can be removed entirely from the 'I lamp, to gire access for trimming or lighting the \viclt,or for taking a, light therefrom while the lamp is burning, the screwenp-b and its cylindrical upper portion Z, forming a closed cap that receives thebase of the tapering wick-tube guide and the perforated 'air-distributor. The wick-tube and reservoir are kept cool, and danger from escaping vapors nvoided.- i

I de not herein claim n lamp-burner formed with a chimney-holder and metal cone that can be lifted oi the wick-tube, neither do I claim herein a draught-plate removable from the wicktnbt?, nor a stationary perforated nir-distributor, these being in my aforesaid patent. l

What I claim, and desire to secure by Letters Patent, is-.

l, The helical expansive interior chimney-clamp m, applied substantially as and for thepnrposcs specified.

2. The closed cap b Z, in combination with the removable nir-distributer' and ta .as and for the purposes set forth.

il. Supporting the chimney upon the burner, by thejoint action of the draught-plate 7L and the vertical paring wick-tube guide g,

springs or scallops around the .elige of thc air-,distributor c, substantially as set forth.

4. The removable air-distributor c and tapering ,guide g, in combination with the Llraughbplatc L, substantially as and for the purposes specified.

In witness whereof, I have hereunto set my signature, this fourteenth day of December, 1867.

L. J. ATWOOD. W'tnesses:

Gno. D. WALKER, CnAs. H. SMITH. 

